50 Kopeks black on dark blue, cut, horizontal pair with stamps in Type I and VII, pane numbers 8 / 9 with complete imprint "Probedruck", as issued mint never hinged without gum, the right stamp from pane number 9 has the printing error VII, which only occurs once in the sheet, the edition of the left stamp from pane number 8 in Type I is 15 copies, thus the horizontal pair is a unique item and belongs to the greatest rarities of the German occupation issues in World War II, signed Z. Mikulski and photo certificate Walter Zirath BPP "The condition is flawless.", Michel 36,000.-